[ChrisAtUpw@........

>     Check out the various pages and tables at http://jclahr.com/science/psn/
> magnitude.html

Thanks for the link.  It means that roughly 1 micron amplitude is
needed for my SEP seismometer to produce a clear signal.  If I had a
better less noisy site for it, I guess I could make out movements of a
few 100 nanometers.

To detect a movement of 1 micron over 10 seconds sounds pretty
impressive.  I'm a bit surprised that this is even possible in a noisy
city.  In fact, the greatest noise problem is the ocean, which
sometimes masks out quakes expected to produce 10 micron movements
even if the storm is 500 km away.

-- 
Steinar Midtskogen
http://voksenlia.net/
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